Was Jem racist in To Kill a Mockingbird?

He matures througout the book. We see him realising that Boo Radley actually wants to stay inside his house. He realises a lot of stuff about the injutice in the American Law system. He also seems to have grown up in the way that he treats Scout and Dill. He tells Atticus when Dill runs away from home, which as Scout says, was the last remaining code of their childhood.